<template>
  <div>
    <div id="slider"
         class="mui-slider">
      <div id="sliderSegmentedControl"
           class="mui-scroll-wrapper mui-slider-indicator mui-segmented-control mui-segmented-control-inverted">
        <div class="mui-scroll">
          <a :class="['mui-control-item',item.id === 0? 'mui-active' : '']"
             v-for="item in cates"
             :key="item.id"
             @click="getPhotoList(item.id)">
            {{item.title}}
          </a>
        </div>
      </div>

    </div>

    <ul class="photolist">
      <router-link v-for="item in list"
                   :key="item.id"
                   :to="'/home/photoInfo/'+item.id"
                   tag="li">
        <img v-lazy="item.img_url">
        <div class="info">
          <div class="info-title">{{item.title}}</div>
          <div class="info-body">{{item.zhaiyao}}</div>
        </div>
      </router-link>
    </ul>
  </div>
</template>

<script>
// 1.导入 mui
import mui from '../../../lib/mui/js/mui.min.js'


export default {
  data () {
    return {
      cates: [],  //图片分类数据
      list: []  //图片列表数据
    }
  },
  created () {
    this.getAllPhotoCates()
    // 一进入页面，主动获取所有的图片列表
    this.getPhotoList(0)
  },
  mounted () {
    // 当组件中的 DOM结构 被渲染好并放到页面上后，会执行这个 钩子函数
    // 如果要操作元素了，最好在 mounted 里面，因为这时候 DOM元素 是最新的
    // 2.初始化
    mui('.mui-scroll-wrapper').scroll({
      deceleration: 0.0005 //flick 减速系数，系数越大，滚动速度越慢，滚动距离越小，默认值0.0006
    })
  },
  methods: {
    getAllPhotoCates () {  //获取图片分类
      this.$http.get('/api/getimgcategory').then(result => {
        if (result.data.status === 0) {
          // 手动拼接出一个最完整的 分类列表
          result.data.message.unshift({ title: "全部", id: 0 })
          this.cates = result.data.message
        }
      })
    },
    getPhotoList (cateId) {  // 获取图片列表
      this.$http.get('/api/getimages/' + cateId).then(result => {
        if (result.data.status === 0) {
          this.list = result.data.message
        }
      })
    }
  }
}
</script>

<style lang="scss" scoped>
* {
  touch-action: pan-y;
}
.photolist {
  list-style: none;
  margin: 0;
  padding: 10px;
  padding-bottom: 0;
  li {
    background: #ccc;
    text-align: center;
    margin-bottom: 10px;
    box-shadow: 0 0 9px #999;
    position: relative;
    img {
      width: 100%;
      vertical-align: middle;
    }
    img[lazy="loading"] {
      width: 40px;
      height: 300px;
      margin: auto;
    }

    .info {
      color: white;
      text-align: left;
      position: absolute;
      bottom: 0;
      background-color: rgba(0, 0, 0, 0.5);
      max-height: 84px;
      .info-title {
        font-size: 15px;
      }
      .info-body {
        font-size: 13px;
      }
    }
  }
}
</style>